Can i use private http proxy with Firefox browser?

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3

  1. I don’t know what ‘no stream isolation’ mean.

  2. If the private proxy is bought anonymously over tor and paid with bitcoins i don’t think the fixed exit node will be a problem.

  3. I don’t know if using the Firefox browser will be bad. If some security addons are installed, like NoScript, Https Everywhere and others, i think Firefox browser will be enough secure. Maybe not as secure as the Tor browser, but still secure.